From mboxrd@z Thu Jan  1 00:00:00 1970
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Date: Thu, 07 Jun 2007 21:27:29 +0200
From: Jan Kiszka <jan.kiszka@domain.hid>
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Subject: Re: [Xenomai-help] Fwd: can't use message pipe - Cannot allocate
 memory
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To: NZG <ngustavson@domain.hid>
Cc: xenomai@xenomai.org

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NZG wrote:
>>> Write does stop throwing errors with a pool of 16384.
>> Just repeating for confirmation: rt_pipe_create with smaller, but
>> non-zero pool sizes doesn't report some error?=20
> Incorrect, if it's created with smaller it does report an error. If it'=
s=20
> created with 0 however, it seems ok. (at least it doesn't throw an erro=
r)

You mean the write fails, but rt_pipe_create is fine. At least here, and
Philippe noticed the same. Looks like the margin for minimal-sized heaps
is broken. 2*PAGE_SIZE should be 3*PAGE_SIZE net space, Philippe?

>=20
>> Pipes are asymmetric: RT<->NRT only.
> RT<->NRT is my goal.
> essentially I=20
> 1. spawn off a real time task which creates a  pipe to receive commands=

> 2. throw commands at it from the user space thread which spawned the re=
al time=20
> process (which is still NRT correct? I'm fuzzy on this).

It is NRT.

Jan


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